/*
 * Copyright 2002-2004 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package org.springframework.binding.value;

/**
 * Adds an index aspect to the backing object mostly used by collection type
 * backing objects. The index can be set to point to a specific item which can
 * be manipulated using get/setValue().
 */
public interface IndexAdapter extends ValueModel {

	/**
	 * Returns the index of the item which is currently being manipulated.
	 */
	public int getIndex();

	/**
	 * Set the index of the item to manipulate.
	 */
	public void setIndex(int index);

	/**
	 * Code to be executed when the index has changed.
	 */
	public void fireIndexedObjectChanged();
}